Methods for designing composite ophthalmic lens surfaces

• US 6,955,433 B1
• Filed: 06/17/2004
• Issued: 10/18/2005
• Est. Priority Date: 06/17/2004
• Status: Active Grant

• Current Assignee: Essilor International SA
• Original Assignee: Johnson & Johnson Vision Care Incorporated (Johnson & Johnson)
• Inventors: Gerligand, Pierre-Yves, Wooley, C. Benjamin
• Primary Examiner(s): Sugarman, Scott J.
• Assistant Examiner(s): Collins, Darryl J.
• Application Number:
  US10/870,080
• Time in Patent Office: 488 Days
• Field of Search: 351/159, 351/160.R, 351/161, 351/164, 351/168, 351/169, 351/177, 351/178
• US Class Current: 351/177
• CPC Class Codes: G02C 7/024 Methods of designing ophthalmic lenses
• CPC Class Codes: G02C 7/028 Special mathematical design techniques
• CPC Class Codes: G02C 7/041 bifocal; multifocal
• CPC Class Codes: G02C 7/061 Spectacle lenses with progressively varying focal power

Abstract

The invention provides a method for designing a composite lens surface by using vector addition of the surface curvatures of two or more lens surfaces and then constructing a surface by numerical integration.

Claims

1. A method for designing an ophthalmic lens surface, comprising the steps of:

a.) calculating a principal curvature and an axis for each of two or more lens surfaces;

b.) performing a vector addition of the curvatures of the surfaces; and

c.) constructing a composite surface using numerical integration.

2. The method of claim 1, wherein each of the two or more surface has a different base curve.

3. The method of claim 1, wherein each of the two or more surfaces comprise a progressive surface.

4. The method of claim 3, wherein each of the progressive surfaces has a different base curve.

5. The method of claim 2, further comprising the step of scaling the x-y values for one of the two or more surfaces in relation to the composite surface.

6. The method of claim 2, further comprising the step of scaling the x-y values for each of the two or more surface in relation to the composite surface.

7. The method of claim 4, further comprising the step of scaling the x-y values for one of the two or more surfaces in relation to the composite surface.

8. The method of claim 4, further comprising the step of scaling the x-y values for each of the two or more surface in relation to the composite surface.

9. The method of claim 5, wherein the scaling is carried out by vector addition of the surface along a path of each of a plurality of lines connecting the surface to a center of rotation of an eye.

10. The method of claim 6, wherein the scaling is carried out by vector addition of each of the two or more surface along a path of each of a plurality of lines connecting the surfaces to a center of rotation of an eye.

11. The method of claim 7, wherein the scaling is carried out by vector addition of the surface along a path of each of a plurality of lines connecting the surface to a center of rotation of an eye.

12. The method of claim 8, wherein the scaling is carried out by vector addition of each of the two or more surface along a path of each of a plurality of lines connecting the surfaces to a center of rotation of an eye.

13. A lens produced by the method of claim 1.

14. A lens produced by the method of claim 2.

15. A lens produced by the method of claim 3.

16. A lens produced by the method of claim 4.